I might have the same problem with the Moodle Mobile App connecting to the MoodleBox:
I'm running the MoodleBox version 2.6.2 (2019-02-03) with Moodle v3.6 on a Raspberry Pi 3B+ with Linux 4.14.79-v7+ armv7l.
My observation is that users with the Moodle Mobile App v3.8.2 can connect to the MoodleBox while users with the latest v3.9.4 cannot. For v3.9.4-users no error is prompted while they have to wait endlessly for the connect.
Did anybody figure out how to connect the latest Moodle Mobile App to the MoodleBox?
Thank you, Frank